Rotary motor



(No Model.) 2 Sheets-Sheet 1. A

A. MGPARLAND.

ROTARY MOTOR. 10.411,827. Paiented oct. 1, 1889.

(No Model.) v 2 Sheets-Sheet 2.

A. MGFARLAND.

ROTARY MOTOR. No. 411,827. Patented Oct. 1, 1889.

UNITED STATES PATENT OFFICE.

ANDRE\V MOFARLAND, OF THOMASTON, MAINE.

ROTARY MOTOR.

SPECIFICATION forming part of Letters Patent No. 411,827', dated October 1, 1889.

Application filed August 3, 1888.

To @ZZ whom iv' may concern-.-

Be it known that I, ANDREW MCFARLAND, of Thomaston, county of Knox, State of Maine, have invented an Improvement in Rotary Motors, of which the following description, in connection with the accompanying drawings, is a speciiicatiomlike letters on the drawings representing like parts.

This invention relates to rotary motors, and has for its object to provide a simple,coin pact, and efficient motor. t

In accordance with my invention the piston of my improved motor is composed of two concentric rings joined by preferably a central web to form with a valvefseat annular chambers, into Which the steam, Water, or other medium or power is admitted continuously. The concentric rings referred to are connected, as shown, by radial arms, to a hub on a shaft or arbor having a bearing in one head or cover of the motor. The inner ring and connecting-Web, as herein shown, are provided with radial slots, invvhich are reciprocated sliding abutments or Wings having their inner ends pivotally connected to rods pivotally secured, as shown, to a hub having a pin or arbor eocentrically mounted in a boss on one of the covers, so that when the piston is revolved the Wings are reciprocated, for a purpose as will be described, by the eccentric refer ed to.

The particular features of my invention will be pointed out in the claims at the end of this specification.

Figure l is a side elevation of a rotary motor embodying my invention, one of the covers or heads being removed; Fig. 2, a section of the motor shown in Fig. 1 on line Fig. 3 an under side view of one of the heads removed, and Fig. e a detail to be referred to.

The shell or cylinder in which the rotary piston is located is composed, as shown, of a ring a, mounted upon legs or supports a', and heads or covers a2 a?, firmly secured to said ring, as by bolts a4. The head or cover d2 is provided, as showmwvith a hub di, forming a bearing for the shaft a of the rotary piston,

constructed as will be described.

The rotary piston referred to is composed of tivo concentric rings l) 7)', connected to sein No. 281,854. da model.)

gether, as shown, by a Web 112, the ring h being connected to arms 113, extended radially from a hub b4, herein showii as cast integral with the shaft ci, a Washer b5 being shown in terposed between the hub b4 and head or cover a2, the said ring, radial arms b3, hub b4, and shaft being preferably cast in one piece. The ringo and web b2 are provided with a series of slots b, extended radially with relation to the center of the rotary piston, the said slots receiving Within them, as herein shown, iiat pieces of metal b?, constituting sliding abut ments or Wings, the ring h having ears bw extended from its inner periphery to afford increased bearing-surfaces for the Wings b?. The wings b7 are connected,as by pivot-rod c, to one end of a rod c', provided at its other end, as shown, with a stud or projection cl2, (see Fig. 2,) fitted into a socket in a cylinder c3, mounted on a spindle or rod c4, eccentrically supported in a hub or boss c5, herein shown assecnred to the head or cover a3, the said hub or boss forming the second bearing for the rotary piston, a flange c6 on a ring b9, forming one of the covers for the piston, being fitted over said hub or boss. The rods c are held in thc sockets or openings in the cylinder c3, as shown, by a Washer c.

The heads or covers CL2 a3, on their inner sides, near their periphery, are provided with annular ribsv or projections ci, constituting guiding-surfaces for the sliding abutments or Wings, the said ribs or projections extending between the piston-rings. Each head or cover is provided, as shown in Fig. 3, with ports d d dand when steam is to be used as the motive power the ports d d alone will be used, the port Z2 being omitted; but When Water or iluid is to be used the port d Will be omitted and the ports d d2 employed, the port d. constituting the inlet for the Water and the port d2 the outlet therefor. Each rib or projection c7 has secured to or forming part of it a metallic block d3, which in practice is fitted steam-tight into the space between the piston-rings b b', as will be described, and forms an abutment or stop for the steam, Water, or other medium employed to drive the motor.

The block d3 is shown in Fig. 3 as fitted between the ports d d', whereby the direction of rotation of the motor may be reversed when desired,the supply of steam or other medium to the ports being controlled by a suitable' cock or valve in a pipe. (Not shown.)

In operation let it be supposed that the piston is rotating in the direction of arrow 20, Fig. l, and that steam is used as the motive power. In this case the port cl2 is cut off and steam or other medium admitted into the Space between the rings through the inletport d', the sliding abutments being in substantially the position shown in Fig. l. The steam admitted into the passage or space between the vpist-on rings acts on the sliding abutment 127 (marked 2) and turns the rotary piston in the direction of arrow 20. As thev piston moves in the direction of arrow 2O the sliding abutments are reciprocated, the slid-A ing abutment Amarked 2 being moved farther forward into its slot until it reaches the highest point of throw of vthe eccentric, whiclnas representedin the drawings, may, for sake of clearness, be supposed to be when the point 21-011 Ithe piston-ring and the center of the stud connected to said sliding abutment'and thelcenter of the spindle c are substantially in the same line. As the vpiston is rotated the next succeeding sliding abutment in rotation (marked 3) `is being moved into its slot to gradually-close the passage or space until it reaches ythe ,position in the drawings occupied bythe abutment marked 4it being entirely closed and steam confined between the abutments 2.and On the further rotation of the piston the abutment 2, which is supposed to bey in .the position now occupied bythe abutmentmarked 4, will gradually be opened, permitting `the steam to exhaust through the A. port d.l Thus it will be seen that each slidingabutment in its turn .is closed and opened during ,one revolution of the piston.

The piston may be rendered steam and water tight, as hercinshown, by packing-rings@ e', preferably made adjustable to take up wear by screws e, or it may be springsA To compensatefor wear of the sliding abutments 11,7, each abutment on its opposite sides is recessed to receive an independent plate e, (see Fig. 2,) the said plate being pressed forward by springs e5 in sockets in the said abutment, and so,'also, the face of the ring b on opposite sides of the abutment may be providedwith an independent piece `or bearingsurface e, located in a recess in the ring, and within which is located a spring e7. So, also, to compensate for wear. upon the block or abutment (Z3, the latter is preferably made as shown in Fig. 3, the said block being cut out or. recessed to receive two smaller pieces es e, providedwith sockets, in which is located a spring elo, aoting to normally force the `said piecesagainst the piston-rings b ZJ, and to compensate for wear upon the web b2 the block di' maybe adj usted, as shown, by push-.screws @12, (see'FiO. 4,) only one of which is shown.

When water or other fluid is to be used as the motive power, the steam-port d may be omitted or cut off by a suitable valve, (not shown,) and the Water or other liuid, when the engine is used fora motor, be admitted through the port dv and exhausted through the port cl2; but when used for a pump the port b2 would constitute the inlet and the port d the outlet.

When used with steam as a motor, rotation of the piston may be reversed-that is, so as to run in a direction opposite to that indicated by arrow 2O--and1in this case the port d would form the inlet and the port d the outlet.

I do not desire to limit myself to the particular form of packing shown. .j

By constructing the piston with tworings lexcessive pressure upon j the bearing of r,the

shaft is relieved,l thereby diminishingthe friction upon the same.

The ring b hassecured to itslsi'desrings193.l

b9, constituting' covers for. the piston to keep' the sliding abutments in place, `an d the said covers form the bearing-'surtace for the inner ring b of the piston.

l. In a rotary motor, the combinatiomwith a shell or cylinder provided with aninlet and exhaust port, of a rotary piston therein consisting of concentricV rings b bf, connectediby a web b2 and `provided with avseriesof, sub-` stantially radial slots, a block lor abutment d3, secured. to the lsaid shell,a main shaft' to which the said `concentric rings areconnected,

and a series of sliding abut'mentsor wings 57,

connected to a hub eccentrically mounted withrelation to the said described. Y Y v `2. In a rotary motor, the' combination, with the shell or cylinder composed ofthe ring a, and heads a? a3, provided Vwith the annular piston, substantially as projections c7 and having an inlet and exhaust port, and a block or abutment cli'secfured tol IOO said annular projections, of ajrotary' piston consisting of concentric rings b b on opposite sides of the said blockory abutment, aweb :63,

connecting said rings and formingwithl the said annular projections steam-spaces',a main shaft to which the said rings are connected, a series of subst-antiallyradial slots inI said rings, anda series o fslidingvabutments or wings bl, fitted into said lslots and connected to a hub eccentrically mounted withxrelation 'to the said main shaft, substantially as described. fi

I n a rotary motor, the combination, with the shell or cylinder composedv of theiringa and heads a2 as, provided with the annular projections c7 and having aninlet and .exhaust port, and a block or abutment d3, secured lto said annular projections, of amrotary'piston consisting of concentric rings .b b. yon opposite sides of the said block or abutment and provided with substantially radial slots, ears bw, secured to the ring b', a web b2, connect- IIOI rigo

ing` said rings and forming with thesaid an- In testimony whereof Ihm-e signed my name nulzu projections steam-spaces, a main shaft to this speocaton in the presence of two subto Which the said rings are connected, and a set-ibing witnesses. series of sliding abutment-s or Wings fitted ANDREV MCFARLAND. 5 into said radial sots and connected to a hub I Vitnesses:

eocentrcally mounted with relation to the said JAS. H. CHURCHILL, main shaft, substantially as described. B, DEWAR. 

